1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
|
/* packet-teredo.c v.1.0
* Routines for Teredo packets disassembly
* draft-huitema-v6ops-teredo-02.txt
*
* Copyright 2003, Ragi BEJJANI - 6WIND - <ragi.bejjani@6wind.com>
* Copyright 2003, Vincent JARDIN - 6WIND - <vincent.jardin@6wind.com>
* Copyright 2004, Remi DENIS-COURMONT
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include "ipproto.h"
#include "prefs.h"
#include "packet-ip.h"
#include "tap.h"
#define UDP_PORT_TEREDO 3544
static int teredo_tap = -1;
static int proto_teredo = -1;
static int hf_teredo_auth = -1;
static int hf_teredo_auth_idlen = -1;
static int hf_teredo_auth_aulen = -1;
static int hf_teredo_auth_id = -1;
static int hf_teredo_auth_value = -1;
static int hf_teredo_auth_nonce = -1;
static int hf_teredo_auth_conf = -1;
static int hf_teredo_orig = -1;
static int hf_teredo_orig_port = -1;
static int hf_teredo_orig_addr = -1;
static gint ett_teredo = -1;
static gint ett_teredo_auth = -1, ett_teredo_orig = -1;
typedef struct {
guint16 th_indtyp;
guint8 th_cidlen;
guint8 th_authdlen;
guint8 th_nonce[8];
guint8 th_conf;
guint8 th_ip_v_hl;
guint16 th_header;
guint16 th_orgport;
guint32 th_iporgaddr;
} e_teredohdr;
static dissector_table_t teredo_dissector_table;
/*static heur_dissector_list_t heur_subdissector_list;*/
static dissector_handle_t data_handle;
static int
parse_teredo_auth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
int offset, e_teredohdr *teredoh)
{
unsigned idlen, aulen;
if (check_col(pinfo->cinfo, COL_INFO))
col_append_sep_str (pinfo->cinfo, COL_INFO, ", ",
"Authentication header");
teredoh->th_indtyp = 1;
offset += 2;
idlen = tvb_get_guint8(tvb, offset);
teredoh->th_cidlen = idlen;
offset++;
aulen = tvb_get_guint8(tvb, offset);
teredoh->th_authdlen = aulen;
offset++;
if (tree) {
proto_item *ti;
ti = proto_tree_add_item(tree, hf_teredo_auth, tvb, offset-4,
13 + idlen + aulen, FALSE);
tree = proto_item_add_subtree(ti, ett_teredo_auth);
proto_tree_add_item(tree, hf_teredo_auth_idlen, tvb,
offset - 2, 1, FALSE);
proto_tree_add_item(tree, hf_teredo_auth_aulen, tvb,
offset - 1, 1, FALSE);
/* idlen is usually zero */
if (idlen) {
proto_tree_add_item(tree, hf_teredo_auth_id, tvb,
offset, idlen, FALSE);
offset += idlen;
}
/* aulen is usually zero */
if (aulen) {
proto_tree_add_item(tree, hf_teredo_auth_value, tvb,
offset, aulen, FALSE);
offset += aulen;
}
proto_tree_add_item(tree, hf_teredo_auth_nonce, tvb,
offset, 8, FALSE);
offset += 8;
proto_tree_add_item(tree, hf_teredo_auth_conf, tvb,
offset, 1, FALSE);
offset++;
}
else
offset += idlen + aulen + 9;
tvb_memcpy(tvb, teredoh->th_nonce, offset - 9, 8);
teredoh->th_conf = tvb_get_guint8(tvb, offset - 1);
return offset;
}
static int
parse_teredo_orig(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
int offset, e_teredohdr *teredoh)
{
if (check_col(pinfo->cinfo, COL_INFO))
col_append_sep_str (pinfo->cinfo, COL_INFO, ", ",
"Origin indication");
if (tree) {
proto_item *ti;
guint16 port;
guint32 addr;
ti = proto_tree_add_item(tree, hf_teredo_orig, tvb, offset,
8, FALSE);
tree = proto_item_add_subtree(ti, ett_teredo_orig);
offset += 2;
port = ~tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(tree, hf_teredo_orig_port, tvb,
offset, 2, port);
offset += 2;
tvb_memcpy(tvb, (guint8 *)&addr, offset, 4);
proto_tree_add_ipv4(tree, hf_teredo_orig_addr, tvb,
offset, 4, ~addr);
offset += 4;
}
else
offset += 8;
teredoh->th_orgport = tvb_get_ntohs(tvb, offset - 6);
tvb_memcpy(tvb, (guint8 *)&teredoh->th_iporgaddr, offset-4, 4);
return offset;
}
/* Determine if there is a sub-dissector and call it. This has been */
/* separated into a stand alone routine to other protocol dissectors */
/* can call to it, ie. socks */
static void
decode_teredo_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,proto_tree *tree, int th_header)
{
tvbuff_t *next_tvb;
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
if (dissector_try_port(teredo_dissector_table, th_header, next_tvb, pinfo, tree))
return;
call_dissector(data_handle,next_tvb, pinfo, tree);
}
static void
dissect_teredo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *teredo_tree;
proto_item *ti;
int offset = 0;
static e_teredohdr teredohstruct[4], *teredoh;
static int teredoh_count = 0;
teredoh_count++;
if(teredoh_count>=4){
teredoh_count=0;
}
teredoh = &teredohstruct[teredoh_count];
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Teredo");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
ti = proto_tree_add_item(tree, proto_teredo, tvb, 0, -1, FALSE);
teredo_tree = proto_item_add_subtree(ti, ett_teredo);
}
else
teredo_tree = NULL;
teredoh->th_header = tvb_get_ntohs(tvb, offset);
if (teredoh->th_header == 1) {
offset = parse_teredo_auth(tvb, pinfo, teredo_tree,
offset, teredoh);
teredoh->th_header = tvb_get_ntohs(tvb, offset);
}
else
teredoh->th_indtyp = 0;
if ( teredoh->th_header == 0 ) {
offset = parse_teredo_orig(tvb, pinfo, teredo_tree,
offset, teredoh);
}
teredoh->th_ip_v_hl = tvb_get_guint8(tvb, offset);
decode_teredo_ports(tvb, offset, pinfo, tree, teredoh->th_header /* , teredoh->th_orgport*/);
tap_queue_packet(teredo_tap, pinfo, teredoh);
}
void
proto_register_teredo(void)
{
static hf_register_info hf[] = {
/* Authentication header */
{ &hf_teredo_auth,
{ "Teredo Authentication header", "teredo.auth",
FT_NONE, BASE_NONE, NULL, 0x0,
"Teredo Authentication header", HFILL }},
{ &hf_teredo_auth_idlen,
{ "Client identifier length", "teredo.auth.idlen",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Client identifier length (ID-len)", HFILL }},
{ &hf_teredo_auth_aulen,
{ "Authentication value length", "teredo.auth.aulen",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Authentication value length (AU-len)", HFILL }},
{ &hf_teredo_auth_id,
{ "Client identifier", "teredo.auth.id",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Client identifier (ID)", HFILL }},
{ &hf_teredo_auth_value,
{ "Authentication value", "teredo.auth.value",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Authentication value (hash)", HFILL }},
{ &hf_teredo_auth_nonce,
{ "Nonce value", "teredo.auth.nonce",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Nonce value prevents spoofing Teredo server.",
HFILL }},
{ &hf_teredo_auth_conf,
{ "Confirmation byte", "teredo.auth.conf",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Confirmation byte is zero upon successful authentication.",
HFILL }},
/* Origin indication */
{ &hf_teredo_orig,
{ "Teredo Origin Indication header", "teredo.orig",
FT_NONE, BASE_NONE, NULL, 0x0,
"Teredo Origin Indication", HFILL }},
{ &hf_teredo_orig_port,
{ "Origin UDP port", "teredo.orig.port",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Origin UDP port", HFILL }},
{ &hf_teredo_orig_addr,
{ "Origin IPv4 address", "teredo.orig.addr",
FT_IPv4, BASE_NONE, NULL, 0x0,
"Origin IPv4 address", HFILL }},
};
static gint *ett[] = {
&ett_teredo, &ett_teredo_auth, &ett_teredo_orig
};
proto_teredo = proto_register_protocol(
"Teredo IPv6 over UDP tunneling", "Teredo", "teredo");
proto_register_field_array(proto_teredo, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
teredo_dissector_table = register_dissector_table("teredo","Teredo ", FT_UINT16, BASE_DEC);
/* register_heur_dissector_list("teredo.heur", &heur_subdissector_list); */
}
void
proto_reg_handoff_teredo(void)
{
dissector_handle_t teredo_handle;
teredo_handle = create_dissector_handle(dissect_teredo, proto_teredo);
data_handle = find_dissector("ipv6");
teredo_tap = register_tap("teredo");
dissector_add("udp.port", UDP_PORT_TEREDO, teredo_handle);
}
|
